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+```
+% pandoc -f markdown -t html --number-sections
+## First section
+
+### Subhead
+
+##### Subhead with gap
+
+## Second section
+^D
+<h2 data-number="1" id="first-section"><span
+class="header-section-number">1</span> First section</h2>
+<h3 data-number="1.1" id="subhead"><span
+class="header-section-number">1.1</span> Subhead</h3>
+<h5 data-number="1.1.0.1" id="subhead-with-gap"><span
+class="header-section-number">1.1.0.1</span> Subhead with gap</h5>
+<h2 data-number="2" id="second-section"><span
+class="header-section-number">2</span> Second section</h2>
+
+```
+
+```
+% pandoc -f markdown -t html --number-sections
+## First section
+
+### Subhead
+
+# Higher-level section
+
+## Sub
+^D
+<h2 data-number="0.1" id="first-section"><span
+class="header-section-number">0.1</span> First section</h2>
+<h3 data-number="0.1.1" id="subhead"><span
+class="header-section-number">0.1.1</span> Subhead</h3>
+<h1 data-number="1" id="higher-level-section"><span
+class="header-section-number">1</span> Higher-level section</h1>
+<h2 data-number="1.1" id="sub"><span
+class="header-section-number">1.1</span> Sub</h2>
+```
+
+For backwards compatibility, we want it to work the old way,
+giving numbers like 0.1, when `--number-offset` is used:
+```
+% pandoc -f markdown -t html --number-sections --number-offset=2,2,2
+## First section
+
+### Subhead
+^D
+<h2 data-number="2.3" id="first-section"><span
+class="header-section-number">2.3</span> First section</h2>
+<h3 data-number="2.3.3" id="subhead"><span
+class="header-section-number">2.3.3</span> Subhead</h3>
+
+```
+
+```
+% pandoc -f markdown -t html --number-sections --number-offset=0,2,2
+## First section
+
+### Subhead
+^D
+<h2 data-number="0.3" id="first-section"><span
+class="header-section-number">0.3</span> First section</h2>
+<h3 data-number="0.3.3" id="subhead"><span
+class="header-section-number">0.3.3</span> Subhead</h3>
+
+```